<template>
  <div class="login_container">

    <div class="login_box">
      <div class="avatar_box">
          <img src="../assets/img/login_logo.jpg" />
      </div>

      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="infor" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>

    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data () {
    return {
      loginForm: {
        username: '',
        password: ''
      },
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 先进行表单预验证，valid为true为通过验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功!')
        // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage 中
        //   1.1 项目中出了登录之外的其他API接口，必须在登录之后才能访问
        //   1.2 token 只应在当前网站打开期间生效，所以将 token 保存在 sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)
        // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #010101;
    height: 100%;
  }
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #E6F1F7;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }
  .avatar_box {
    height: 192px;
    width: 230px;
    border: 1px solid #1A1212;
    border-radius: 50%;
    padding: 8px;
    box-shadow: 0 0 20px #1A1212;
    background-color: #120D0D;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -66%);
    img {
      width: 100%;
      height: 100%;
      border-radius: 40%;
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    box-sizing: border-box;
    padding: 0 20px;
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }

</style>
